METHOD AND CIRCUIT FOR SIGNAL TRANSMISSION VIA A CURRENT LOOP
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Abstract
A method for signal transmission between a first and a second system; wherein the first and the second system are connected with one another via a current loop. A direct current signal is transmitted in a first frequency range and an alternating current signal in a second frequency range via the current loop. The direct current signal and the alternating current signal are superimposed and the alternating current signal is used for digital signal transmission and the direct current signal is used for analog signal transmission. By means of a control unit, a first data stream is produced, in which the direct current signal and alternating current signal to be set in the current loop are digitally encrypted. The first data stream is transmitted to an electrical current output circuit and the transmitted first data stream is converted by the electrical current output circuit into an electrical current signal. The electrical current signal is composed of the superimposed direct current signal and alternating current signal, or the transmitted first data stream is converted by the electrical current output circuit into the direct current signal and the alternating current signal. The electrical current signal or the direct current signal and the alternating current signal are set in the current loop.
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Citations
88 Claims
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1-44. -44. (canceled)
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45. A method for signal transmission between a first and a second system, wherein the first and the second system connected with one another via a current loop, a direct current signal is transmitted in a first frequency range and an alternating current signal is transmitted in a second frequency range via the current loop, the direct current signal and the alternating current signal are superimposed, the alternating current signal is used for digital signal transmission and the direct current signal is used for analog signal transmission, comprising the steps of:
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producing by means of a control unit, a first data stream, in which the direct current signal and the alternating current signal to be set in the current loop are digitally encrypted; transmitting the first data stream to an electrical current output circuit; and converting the transmitted first data stream by the electrical current output circuit into an electrical current signal, wherein; the electrical current signal is composed of the superimposed direct current signal and alternating current signal, or that the transmitted first data stream is converted by the electrical current output circuit into the direct current signal and the alternating current signal; and the electrical current signal or the direct current signal and the alternating current signal are set in the current loop. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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66. The electrical and/or electronic circuit for signal transmission between a first and a second system, said first and said second system are connected with one another via a current loop, wherein the current loop serves to transmit a direct current signal in a first frequency range and an alternating current signal in a second frequency range, wherein the alternating current signal and the direct current signal are superimposed, and wherein the direct current signal serves for analog signal transmission and the alternating current signal serves for digital signal transmission, comprising:
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a control unit, which serves for producing a first data stream, which the direct current signal and alternating current signal to be set in the current loop are digitally encrypted; an electrical current output circuit; and a first transmission unit, which serves to transmit said first data stream to said electrical current output circuit, wherein; said electrical current output circuit serves to convert said transmitted first data stream into an electrical current signal; and said electrical current signal is composed of the superimposed direct current signal and alternating current signal, or the electrical current output circuit serves to convert the transmitted first data stream into the direct current signal and the alternating current signal. - View Dependent Claims (67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87)
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88. The field device of process and/or automation technology having an electrical and/or electronic circuit, comprising:
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a control unit, which serves for producing a first data stream, which the direct current signal and alternating current signal to be set in the current loop are digitally encrypted; an electrical current output circuit; and a first transmission unit, which serves to transmit said first data stream to said electrical current output circuit, wherein; said electrical current output circuit serves to convert said transmitted first data stream into an electrical current signal; and said electrical current signal is composed of the superimposed direct current signal and alternating current signal, or the electrical current output circuit serves to convert the transmitted first data stream into the direct current signal and the alternating current signal.
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Specification